Re: [CentOS] RHEL/CentOS 7 Dual boot with CentOS 5.x/6.x - default boot quick solution/howto

On 22.03.2014 17:46, Ljubomir Ljubojevic wrote:

I have RHEL 7 Beta installed in dual boot with CentOS 6.x. Since RHEL 7 installed GRUB2, I had problem that RHEL 7 is default boot.

My personal solution was to go to /etc/grub.d and run command: mv 10_linux 31_linux

grub2-mkconfig -o /boot/grub2/grub.cfg

Explanation:

• /etc/grub.d is where grub2 writes down config files used to create

boot menu.

• OS-prober creates 30_os-prober file in /etc/grub.d
• 10_linux is created for RHEL/CentOS 7.x system installed.

If you change order of files in /etc/grub.d (numbers at the start of the files) the list generated with grub2-mkconfig will change order in the GRUB2 menu :)

Oh boy, I'm so going to miss Grub 0.97.. Thanks for sharing, though!